University of Illinois Urbana-Champaign

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Showing 2011–2040 of 2,492 items
Thumbnail for Vermilion River (Illinois River Basin) area assessment
Vermilion River (Illinois River Basin) area assessment
Illinois Deptartment of Natural Resources

Thumbnail for Geology of the fluorspar deposits of Illinois
Geology of the fluorspar deposits of Illinois
Weller, James Marvin; Grogan, Robert Mann; Tippie, Frank Emerson, joint author